Question

A pulse (shown here) is reflected from the rigid wall $A$ and then from free end $B$. The shape of the string after these $2$ reflections will be -

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

$1^{\text{st}}$ reflection :
The end $A$ is fixed, therefore, reflected pulse has phase difference of $\pi$, hence pulse get erect.
$2^{\text{nd}}$ reflection :
The end $B$ is free, therefore, pulse gets reflected without any kind of inversion.